global: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Complete this rename for all directories outside arch/ board/ drivers/
and include/

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/Makefile b/lib/Makefile
index d300249..66f8440 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -3,7 +3,7 @@
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 
 obj-$(CONFIG_EFI) += efi/
 obj-$(CONFIG_EFI_LOADER) += efi_driver/
@@ -96,7 +96,7 @@
 obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/
 obj-$(CONFIG_$(SPL_TPL_)OF_REAL) += fdtdec_common.o fdtdec.o
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16-ccitt.o
 obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16-ccitt.o
 obj-$(CONFIG_MMC_SPI_CRC_ON) += crc16-ccitt.o
@@ -131,7 +131,7 @@
 obj-$(CONFIG_LIB_RAND) += rand.o
 obj-y += panic.o
 
-ifeq ($(CONFIG_SPL_BUILD),y)
+ifeq ($(CONFIG_XPL_BUILD),y)
 # SPL U-Boot may use full-printf, tiny-printf or none at all
 ifdef CONFIG_$(SPL_TPL_)USE_TINY_PRINTF
 obj-$(CONFIG_$(SPL_TPL_)SPRINTF) += tiny-printf.o